1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
#include "utils.hpp"
#define PUBLIC "0.0.0.0"
#define LOCAL "127.0.0.1"
#define IP PUBLIC
#define PORT "4444"
int main(int argc, char** argv);
int start_server(Options* options);
void* handle_connections(void* poptions);
void* handle_client(void* pclient_fd);
int parse_arguments(int argc, char** argv, Options* options);
int print_help();
Options options {};
std::vector<int> clients;
int main(int argc, char** argv)
{
int status;
options.server = true;
strncpy(options.ip, IP, sizeof(options.ip));
strncpy(options.port, PORT, sizeof(options.port));
strncpy(options.name, "Server", sizeof(options.name));
options.encryption = false;
options.pass = false;
strncpy(options.password, DEFAULT_PASS, sizeof(options.password));
options.interactive = false;
options.max_clients = -1;
status = parse_arguments(argc, argv, &options);
if(status)
{
print_help();
goto end;
}
status = start_server(&options);
if(status)
{
ERROR_LOG("Failed to start server.\n");
goto end;
}
INFO_LOG("Succesfully started server.\n");
if(options.interactive)
start_client(&clients, &options);
pause();
end:
return status;
}
int start_server(Options* options)
{
options->sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(options->sockfd < 0)
return 1;
sockaddr_in sockaddr;
memset(&sockaddr, 0, sizeof(sockaddr));
sockaddr.sin_family = AF_INET;
sockaddr.sin_addr.s_addr = inet_addr(options->ip);
sockaddr.sin_port = htons(atoi(options->port));
if(bind(options->sockfd, (struct sockaddr*)&sockaddr, sizeof(sockaddr)))
return 2;
if(listen(options->sockfd, 1))
return 3;
pthread_t connections_thread;
if(pthread_create(&connections_thread, NULL, handle_connections, (void*)options))
return 4;
return 0;
}
void* handle_connections(void* poptions)
{
Options* options = (Options*)poptions;
sockaddr_in sockaddr;
socklen_t addrlen = sizeof(sockaddr);
int connection;
while((connection = accept(options->sockfd, (struct sockaddr*)&sockaddr, &addrlen)))
{
if(connection < 0)
return 0;
if((int)(&clients)->size() == options->max_clients)
{
ERROR_LOG("Client limit reached. New client has been forbidden to connect.\n");
close(connection);
continue;
}
pthread_t client_thread;
if(pthread_create(&client_thread, NULL, handle_client, (void*)(intptr_t)connection))
return 0;
}
return 0;
}
void* handle_client(void* pclient_fd)
{
int client_fd = (intptr_t)pclient_fd;
Packet incoming_packet;
bool first = true;
char name[20];
int read_size;
while((read_size = recv(client_fd, &incoming_packet, sizeof(incoming_packet), 0)) > 0)
{
int result = handle_incoming_packet(&incoming_packet, &client_fd, &clients, &options);
if(result == -1)
{
ERROR_LOG("Invalid packet recieved.\n");
break;
}
else if(result == -3)
return 0;
else if(result > 0)
{
ERROR_LOG("Error handling packet recieved.\n");
break;
}
if(first && incoming_packet.type == PacketType::packet_ping)
{
first = false;
strncpy(name, incoming_packet.data.packet_ping.name, sizeof(name));
}
}
if(strlen(name) > 0)
{
Packet dc_packet {};
dc_packet.type = PacketType::packet_disconnect;
strncpy(dc_packet.data.packet_disconnect.name, name, sizeof(dc_packet.data.packet_disconnect.name));
if(options.encryption)
encrypt(&options, (char*)&dc_packet, sizeof(dc_packet));
handle_incoming_packet(&dc_packet, &client_fd, &clients, &options);
}
close(client_fd);
return 0;
}
int parse_arguments(int argc, char** argv, Options* options)
{
extern char* optarg;
int status = 0;
int option;
while((option = getopt(argc, argv, "p:en:ix:h")) != -1)
switch(option)
{
case 'p':
strncpy(options->port, optarg, sizeof(options->port));
break;
case 'e':
options->encryption = true;
break;
case 'n':
options->max_clients = atoi(optarg);
break;
case 'i':
options->interactive = true;
break;
case 'x':
options->pass = true;
strncpy(options->password, optarg, sizeof(options->password));
break;
case 'h':
print_help();
break;
case ':':
status = 1;
break;
case '?':
status = 1;
break;
}
return status;
}
int print_help()
{
printf(
"Usage:\n"
"\t./server\n"
"\t\t-p (PORT) [port number]\n"
"\t\t-e [encryption]\n"
"\t\t-n (NUM_CLIENTS) [max clients]\n"
"\t\t-i [interactive]\n"
"\t\t-x (PASS) [pasword]\n"
"\t\t-h [show help]\n"
);
return 0;
}
|
